Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/sound/soc/codecs/rt5645.h b/sound/soc/codecs/rt5645.h
index cc24557..e2d72ae 100644
--- a/sound/soc/codecs/rt5645.h
+++ b/sound/soc/codecs/rt5645.h
@@ -1,12 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * rt5645.h  --  RT5645 ALSA SoC audio driver
  *
  * Copyright 2013 Realtek Microelectronics
  * Author: Bard Liao <bardliao@realtek.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #ifndef __RT5645_H__